Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: DLLSTXREDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
469-737 A Dallas TX 9533 SOUTHWESTERN BELL 552      
469-828 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-248 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-250 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-267 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-380 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-381 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-407 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-447 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-588 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-713 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-732 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-733 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-735 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-738 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-818 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-820 A Carrollton TX 7726 SOUTHWESTERN BELL TELEPHONE COMPANY - TX 552      
972-930 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-931 A Dallas TX 9533 SOUTHWESTERN BELL 552      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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